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The State Department established a Health Incidents Response Task Force last month to look into "unexplained health incidents" affecting Americans in Cuba and China, according to a statement from Secretary Mike Pompeo.

The big picture: The task force found that 24 government officials and family members in Cuba showed symptoms "similar to those noted following concussion or minor traumatic brain injury." One person in China was found to have similar symptoms. Per Pompeo's statement, the "nature of the injuries suffered by the affected personnel, and whether a common cause exists for all cases, has not yet been established."